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perf(shadow): increase depth map resolution and refine PCF sampling

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zhenyan121
2026-06-17 15:23:38 +08:00
parent 662f10047a
commit 31bf337f6f
3 changed files with 40 additions and 16 deletions
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19
src/renderer.cpp
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@@ -470,8 +470,8 @@ void Renderer::updata_framebuffer(int width, int height) {
glGenTextures(1, &m_depth_map_texture);
glBindTexture(GL_TEXTURE_2D, m_depth_map_texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, DEPTH_MAP_WIDTH,
DEPTH_MAP_HEIGHT, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32F, DEPTH_MAP_SIZE,
DEPTH_MAP_SIZE, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
@@ -506,7 +506,7 @@ void Renderer::render_world() {
glm::vec3 cam_pos = m_camera.get_camera_pos();
glm::vec3 cam_fwd = m_camera.get_camera_front();
float half_extent = 256.0f;
float half_extent = 128.0f;
glm::vec3 center = cam_pos + cam_fwd * (half_extent * 0.5f);
@@ -515,24 +515,27 @@ void Renderer::render_world() {
fabs(sundir.y) > 0.99f ? glm::vec3(0, 0, 1) : glm::vec3(0, 1, 0);
glm::mat4 light_basis = glm::lookAt(glm::vec3(0.0f), sundir, up);
float texels_per_unit = DEPTH_MAP_WIDTH / (half_extent * 2.0f);
float texels_per_unit = DEPTH_MAP_SIZE / (half_extent * 2.0f);
glm::vec3 ls_center = glm::vec3(light_basis * glm::vec4(center, 1.0f));
ls_center.x = std::round(ls_center.x * texels_per_unit) / texels_per_unit;
ls_center.y = std::round(ls_center.y * texels_per_unit) / texels_per_unit;
glm::vec3 snapped_center =
glm::vec3(glm::inverse(light_basis) * glm::vec4(ls_center, 1.0f));
float distance = 128.0f;
float distance = half_extent * 1.5f;
float near_plane = 1.0f;
float far_plane = distance + half_extent * 2.0f;
glm::vec3 light_pos = snapped_center - sundir * distance;
glm::mat4 light_view = glm::lookAt(light_pos, snapped_center, up);
glm::mat4 light_projection = glm::ortho(
-half_extent, half_extent, -half_extent, half_extent, 1.0f, 500.0f);
glm::mat4 light_projection =
glm::ortho(-half_extent, half_extent, -half_extent, half_extent,
near_plane, far_plane);
glm::mat4 light_space_matrix = light_projection * light_view;
glUniformMatrix4fv(depth_shader.loc("lightSpaceMatrix"), 1, GL_FALSE,
glm::value_ptr(light_space_matrix));
glViewport(0, 0, DEPTH_MAP_WIDTH, DEPTH_MAP_WIDTH);
glViewport(0, 0, DEPTH_MAP_SIZE, DEPTH_MAP_SIZE);
glCullFace(GL_FRONT);
glBindFramebuffer(GL_FRAMEBUFFER, m_depth_map_fbo);