416 lines
16 KiB
C++
416 lines
16 KiB
C++
#include "pch.h"
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#include "log.h"
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#include "brush.h"
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void BrushMesh::draw(const std::vector<StrokeSample>& samples, const glm::mat4& proj)
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{
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std::vector<instance_t> attributes;
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attributes.reserve(samples.size());
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for (const auto& s : samples)
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{
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auto mvp = proj *
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glm::translate(s.pos) *
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glm::scale(glm::vec3(s.size, s.size, 1)) *
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glm::eulerAngleZ(s.angle);
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attributes.emplace_back(instance_t{ mvp, s.flow });
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}
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#ifdef USE_VBO
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glBindBuffer(GL_ARRAY_BUFFER, buffers[2]);
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glBufferData(GL_ARRAY_BUFFER, (int)(sizeof(instance_t) * attributes.size()), attributes.data(), GL_STATIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glBindVertexArray(vao);
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glDrawElementsInstanced(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0, (int)samples.size());
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glBindVertexArray(0);
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#else
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glEnableVertexAttribArray(0);
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glEnableVertexAttribArray(1);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffers[1]);
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glBindBuffer(GL_ARRAY_BUFFER, buffers[0]);
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glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, sizeof(vertex_t), (GLvoid*)offsetof(vertex_t, pos));
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(vertex_t), (GLvoid*)offsetof(vertex_t, uvs));
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// Likewise, we can do the same with the model matrix. Note that a
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// matrix input to the vertex shader consumes N consecutive input
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// locations, where N is the number of columns in the matrix. So...
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// we have four vertex attributes to set up.
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glBindBuffer(GL_ARRAY_BUFFER, buffers[2]);
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glBufferData(GL_ARRAY_BUFFER, (int)(sizeof(instance_t) * attributes.size()), attributes.data(), GL_STATIC_DRAW);
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// Loop over each column of the matrix...
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for (int i = 0; i < 4; i++)
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{
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// Set up the vertex attribute
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glVertexAttribPointer(loc_mvp + i, 4, GL_FLOAT, GL_FALSE, sizeof(instance_t),
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(GLvoid*)(offsetof(instance_t, mvp) + sizeof(glm::vec4) * i));
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// Enable it
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glEnableVertexAttribArray(loc_mvp + i);
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// Make it instanced
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glVertexAttribDivisor(loc_mvp + i, 1);
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}
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glEnableVertexAttribArray(loc_flow);
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glVertexAttribPointer(loc_flow, 1, GL_FLOAT, GL_FALSE, sizeof(instance_t),
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(GLvoid*)offsetof(instance_t, flow));
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glVertexAttribDivisor(loc_flow, 1);
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glDrawElementsInstanced(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0, (int)samples.size());
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//glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
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glDisableVertexAttribArray(0);
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glDisableVertexAttribArray(1);
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for (int i = 0; i < 4; i++)
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glDisableVertexAttribArray(loc_mvp + i);
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glDisableVertexAttribArray(loc_flow);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
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#endif // USE_VBO
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}
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bool BrushMesh::create()
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{
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static GLushort idx[6]{ 0, 1, 2, 0, 2, 3 };
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static vertex_t vertices[4]{
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{ { -.5f, -.5f, 0, 1 }, { 0, 0 } }, // A B----C
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{ { -.5f, .5f, 0, 1 }, { 0, 1 } }, // B --\ | |
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{ { .5f, .5f, 0, 1 }, { 1, 1 } }, // C --/ | |
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{ { .5f, -.5f, 0, 1 }, { 1, 0 } }, // D A----D
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};
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glGenBuffers(3, buffers);
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if (!(buffers[0] && buffers[1] && buffers[2]))
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return false;
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static instance_t inst{ glm::mat4(1), .1f };
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glBindBuffer(GL_ARRAY_BUFFER, buffers[2]);
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glBufferData(GL_ARRAY_BUFFER, sizeof(instance_t), &inst, GL_STATIC_DRAW);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffers[1]);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(idx), idx, GL_STATIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, buffers[0]);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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auto shader = ShaderManager::get(kShader::BrushStroke);
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loc_flow = shader->GetAttribLocation("a_flow");
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loc_mvp = shader->GetAttribLocation("a_mvp");
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#if USE_VBO
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glGenVertexArrays(1, &vao);
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if (!vao)
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return false;
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glBindVertexArray(vao);
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glEnableVertexAttribArray(0);
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glEnableVertexAttribArray(1);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffers[1]);
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glBindBuffer(GL_ARRAY_BUFFER, buffers[0]);
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glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, sizeof(vertex_t), (GLvoid*)offsetof(vertex_t, pos));
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(vertex_t), (GLvoid*)offsetof(vertex_t, uvs));
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glBindBuffer(GL_ARRAY_BUFFER, buffers[2]);
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// Loop over each column of the matrix...
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for (int i = 0; i < 4; i++)
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{
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// Set up the vertex attribute
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glVertexAttribPointer(loc_mvp + i, 4, GL_FLOAT, GL_FALSE, sizeof(instance_t),
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(GLvoid*)(offsetof(instance_t, mvp) + sizeof(glm::vec4) * i));
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// Enable it
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glEnableVertexAttribArray(loc_mvp + i);
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// Make it instanced
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glVertexAttribDivisor(loc_mvp + i, 1);
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}
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glEnableVertexAttribArray(loc_flow);
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glVertexAttribPointer(loc_flow, 1, GL_FLOAT, GL_FALSE, sizeof(instance_t),
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(GLvoid*)offsetof(instance_t, flow));
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glVertexAttribDivisor(loc_flow, 1);
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glBindVertexArray(0);
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#endif
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return true;
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}
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StrokeSample Stroke::randomize_sample(const glm::vec3& pos, float pressure, float dir_angle)
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{
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auto rnd_nor = [&] { return float((double)prng() / (double)prng.max()); }; // normalized [0, +1]
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auto rnd_neg = [&] { return float((double)prng() / (double)prng.max() * 2.0 - 1.0); }; // normalized [-1, +1]
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auto rnd_rad = [&] { return float((double)prng() / (double)prng.max() * M_PI * 2.0); }; // normalized [0, 2pi]
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auto rnd_vec = [&] { float rad = rnd_rad(); return glm::vec3(cosf(rad), sinf(rad), 0); }; // normalized direction vector
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auto rnd_bneg = [&] { return prng() % 2 == 0 ? -1.f : 1.f; }; // -1 or 1
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float size_dyn = m_brush->m_tip_size_pressure ? pressure : 1.f;
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float flow_dyn = m_brush->m_tip_flow_pressure ? pressure : 1.f;
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float opacity_dyn = m_brush->m_tip_opacity_pressure ? pressure : 1.f;
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float size = glm::min(m_brush->m_tip_size / glm::tan(glm::radians(m_camera.fov * 0.5f)), m_max_size);
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float randflipx = m_brush->m_tip_randflipx ? rnd_bneg() : 1.f;
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float randflipy = m_brush->m_tip_randflipy ? rnd_bneg() : 1.f;
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glm::vec2 scatter_axis = m_brush->m_jitter_scatter_bothaxis ? glm::vec2(1.f, 1.f) : glm::vec2(0.f, 1.f);
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auto scatter_scale = glm::vec3(scatter_axis * glm::orientate2(-dir_angle), 1.f);
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float aspect_jitter = m_brush->m_jitter_aspect_bothaxis ?
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rnd_neg() * 0.5f * m_brush->m_jitter_aspect :
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rnd_nor() * 0.5f * m_brush->m_jitter_aspect;
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float aspect = glm::clamp(m_brush->m_tip_aspect + aspect_jitter, 0.1f, 0.9f);
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glm::vec2 aspect_scale = {
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(aspect <= 0.5 ? aspect * 2.f : 1.f),
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(aspect > 0.5 ? 1.f - (aspect - .5f) * 2.f : 1.f)
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};
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StrokeSample s;
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s.origin = pos;
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s.scale = m_brush->m_tip_scale * randflipx * (m_brush->m_tip_flipx ? -1.f : 1.f) * aspect_scale;
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s.angle = (m_brush->m_tip_angle + rnd_neg() * m_brush->m_jitter_angle) * (float)(M_PI * 2.0);
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s.size = size * (1.f - rnd_nor() * m_brush->m_jitter_scale) * size_dyn;
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s.pos = pos + (scatter_scale * rnd_vec() * m_brush->m_jitter_scatter * s.size * 0.5f); // 0.5 because PS scatters by half size
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s.flow = m_brush->m_tip_flow * (1.f - rnd_nor() * m_brush->m_jitter_flow) * flow_dyn;
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s.opacity = m_brush->m_tip_opacity * (1.f - rnd_nor() * m_brush->m_jitter_opacity) * opacity_dyn;
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auto hsv = convert_rgb2hsv(m_brush->m_tip_color);
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hsv.x = glm::clamp(glm::mix(hsv.x, (pressure - 0.5f) * 2.0f, m_brush->m_tip_hue) + (rnd_nor() - 0.5f) * m_brush->m_jitter_hue, 0.f, 1.f);
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hsv.y = glm::clamp(glm::mix(hsv.y, (1.f - pressure - 0.5f) * 2.0f, m_brush->m_tip_sat) + (rnd_nor() - 0.5f) * m_brush->m_jitter_sat, 0.f, 1.f);
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hsv.z = glm::clamp(glm::mix(hsv.z, (pressure - 0.5f) * 2.0f, m_brush->m_tip_val) + (rnd_nor() - 0.5f) * m_brush->m_jitter_val, 0.f, 1.f);
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m_hsv_jitter.add(hsv);
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s.col = convert_hsv2rgb(m_hsv_jitter.average());
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return s;
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}
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std::vector<StrokeSample> Stroke::compute_samples()
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{
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if (m_keypoints.empty()) return {};
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int nsamples = (int)glm::floor((m_keypoints.back().dist - m_dist) / m_step);
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std::vector<StrokeSample> samples;
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samples.reserve(nsamples); // preallocate the estimate number of samples
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while (m_keypoints.back().dist > (m_dist + m_step))
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{
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m_dist += m_step;
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m_dir_dist += m_step;
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int old_kp = m_last_kp;
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while (m_dist > m_keypoints[m_last_kp + 1].dist)
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m_last_kp++;
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const auto& A = m_keypoints[old_kp];
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const auto& B = m_keypoints[m_last_kp == old_kp ? m_last_kp + 1 : m_last_kp]; // NOTE: this should be true when while is true
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float t = (m_dist - A.dist) / (B.dist - A.dist); // NOTE: must be A != B
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auto pos = glm::lerp(A.pos, B.pos, t);
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float pressure = glm::lerp(A.pressure, B.pressure, t);
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if (m_dir_dist > m_dir_step && m_last_kp != m_dir_kp)
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{
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glm::vec2 v = glm::normalize(m_keypoints[m_last_kp].pos - m_keypoints[m_dir_kp].pos);
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m_dir_angle = -glm::orientedAngle(v, m_dir_ref);
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if (m_brush->m_tip_angle_smooth > 0 && (glm::abs(m_dir_angle) > glm::radians(30.f) || !m_dir_valid))
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{
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if (glm::abs(m_dir_angle) > glm::radians(100.f))
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{
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//LOG("BIG ANGLE");
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m_direction.clear();
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}
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auto old_dir = m_dir_ref;
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m_dir_ref = v;
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m_dir_ref_angle = -glm::orientedAngle(m_dir_ref, { 1, 0 });
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m_dir_angle = 0;
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auto angle_diff = -glm::orientedAngle(m_dir_ref, old_dir);
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for (int i = 0; i < m_direction.m_count; i++)
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m_direction.m_vec[i] -= angle_diff;
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}
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m_dir_kp = m_last_kp;
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m_dir_dist = 0;
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if (!m_dir_valid)
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{
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m_dir_init = m_dir_angle + m_dir_ref_angle;
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m_dir_valid = true;
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}
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}
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bool need_dir = false;
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need_dir |= m_brush->m_tip_angle_follow;
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need_dir |= m_brush->m_tip_angle_init;
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need_dir |= m_brush->m_jitter_angle > 0;
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// angle is not ready yet
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if (need_dir && !m_dir_valid)
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continue;
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auto s = randomize_sample(pos, pressure, m_dir_angle + m_dir_ref_angle);
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if (s.valid())
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{
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if (m_brush->m_tip_angle_follow)
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{
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m_direction.add(m_dir_angle);
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s.angle += m_direction.average() + m_dir_ref_angle;
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}
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else if (m_brush->m_tip_angle_init)
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{
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s.angle += m_dir_init;
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}
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m_prev_sample = s;
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samples.push_back(s);
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}
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else
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{
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LOG("Invalid sample");
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}
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}
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return samples;
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}
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bool Stroke::has_sample()
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{
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return m_keypoints.empty() ? false : // no keypoints
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(m_keypoints.back().dist > (m_dist + m_step)); // check if next kp is closer than spacing
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}
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void Stroke::reset(bool clear_keypoints /*= false*/)
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{
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m_dir_kp = 0;
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m_dir_angle = 0;
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m_dir_valid = false;
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m_dir_dist = 0;
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m_last_kp = 0;
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m_dist = 0.f;
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if (clear_keypoints)
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m_keypoints.clear();
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}
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void Stroke::add_point(glm::vec3 pos, float pressure)
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{
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#ifdef __IOS__
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m_curve = glm::min(m_curve + 0.1f, 1.f);
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//pressure = pressure * glm::pow(m_curve, 2.f);
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if (m_filter_points && m_hold_points.size() < 5)
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{
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m_hold_points.push_back({pos, pressure});
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return;
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}
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#endif // __IOS__
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//m_pressure_buff.add(pressure);
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//pressure = m_pressure_buff.average();
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if (m_brush->m_tip_size_pressure)
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{
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float aspect_width = glm::min(1.f, glm::clamp(m_brush->m_tip_aspect, .1f, .9f) * 2.f);
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float raw_size = glm::clamp(m_brush->m_tip_size / glm::tan(glm::radians(m_camera.fov * 0.5f)), 1.f, m_max_size);
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float size = aspect_width * glm::min(m_brush->m_tip_scale.x, m_brush->m_tip_scale.y) * raw_size;
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m_step = glm::max(0.5f, m_brush->m_tip_spacing * size);
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}
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float dist = m_keypoints.empty() ? m_step :
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m_keypoints.back().dist + glm::distance(m_keypoints.back().pos, pos);
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if (m_keypoints.empty())
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m_prev_sample = randomize_sample(pos, pressure, 0);
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else if (m_keypoints.back().pos == pos)
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return; // skip same point, leading to black samples (NaN values)
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Keypoint kp;
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kp.pos = pos;
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kp.pressure = pressure;
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kp.dist = dist;
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m_keypoints.push_back(kp);
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}
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void Stroke::start(const std::shared_ptr<Brush>& brush)
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{
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m_hold_points.clear();
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m_curve = 0.f;
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m_direction.clear();
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m_pressure_buff.clear();
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m_hsv_jitter.clear();
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m_last_kp = 0;
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m_dist = 0.f;
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m_dir_kp = 0;
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m_dir_angle = 0;
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m_dir_valid = false;
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m_dir_dist = 0;
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m_brush = brush;
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float aspect_width = glm::min(1.f, glm::clamp(m_brush->m_tip_aspect, .1f, .9f) * 2.f);
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float raw_size = glm::clamp(m_brush->m_tip_size / glm::tan(glm::radians(m_camera.fov * 0.5f)), 1.f, m_max_size);
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float size = aspect_width * glm::min(m_brush->m_tip_scale.x, m_brush->m_tip_scale.y) * raw_size;
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m_step = glm::max(0.5f, m_brush->m_tip_spacing * size);
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m_direction.resize(std::max<int>(1, m_brush->m_tip_angle_smooth * 200.f / m_step));
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prng.seed(0);
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}
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bool Brush::load_tip(const std::string& path, const std::string& thumb)
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{
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m_tip_texture = std::make_shared<Texture2D>();
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if (!m_tip_texture->load(path))
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{
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m_tip_texture = nullptr;
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return false;
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}
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m_tip_texture->create_mipmaps();
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m_tip_texture->auto_destroy = true;
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m_brush_path = path;
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m_brush_thumb_path = thumb;
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auto sz = m_tip_texture->size();
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m_tip_scale = sz.y > sz.x ? glm::vec2(sz.x / sz.y, 1.f) : glm::vec2(1.f, sz.y / sz.x);
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return true;
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}
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bool Brush::load_dual(const std::string& path, const std::string& thumb)
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{
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m_dual_texture = std::make_shared<Texture2D>();
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if (!m_dual_texture->load(path))
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{
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m_dual_texture = nullptr;
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return false;
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}
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m_dual_texture->create_mipmaps();
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m_dual_texture->auto_destroy = true;
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m_dual_path = path;
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m_dual_thumb_path = thumb;
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return true;
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}
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bool Brush::load_pattern(const std::string& path, const std::string& thumb)
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{
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m_pattern_texture = std::make_shared<Texture2D>();
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if (!m_pattern_texture->load(path))
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{
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m_pattern_texture = nullptr;
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return false;
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}
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m_pattern_texture->create_mipmaps();
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m_pattern_texture->auto_destroy = true;
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m_pattern_path = path;
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m_pattern_thumb_path = thumb;
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return true;
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}
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bool Brush::load()
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{
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if (!m_brush_path.empty())
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{
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m_tip_texture = std::make_shared<Texture2D>();
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if (!m_tip_texture->load(m_brush_path))
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{
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LOG("failed to load %s", m_brush_path.c_str());
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m_tip_texture = nullptr;
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return false;
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}
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m_tip_texture->create_mipmaps();
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m_tip_texture->auto_destroy = true;
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}
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if (!m_dual_path.empty())
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{
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m_dual_texture = std::make_shared<Texture2D>();
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if (!m_dual_texture->load(m_dual_path))
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{
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LOG("failed to load %s", m_dual_path.c_str());
|
|
m_tip_texture = nullptr;
|
|
m_dual_texture = nullptr;
|
|
return false;
|
|
}
|
|
m_dual_texture->create_mipmaps();
|
|
m_dual_texture->auto_destroy = true;
|
|
}
|
|
if (!m_pattern_path.empty())
|
|
{
|
|
m_pattern_texture = std::make_shared<Texture2D>();
|
|
if (!m_pattern_texture->load(m_pattern_path))
|
|
{
|
|
LOG("failed to load %s", m_pattern_path.c_str());
|
|
m_tip_texture = nullptr;
|
|
m_dual_texture = nullptr;
|
|
m_pattern_texture = nullptr;
|
|
return false;
|
|
}
|
|
m_pattern_texture->create_mipmaps();
|
|
m_pattern_texture->auto_destroy = true;
|
|
}
|
|
return true;
|
|
}
|