diff options
Diffstat (limited to 'src/mbgl/renderer/prerendered_texture.cpp')
| -rw-r--r-- | src/mbgl/renderer/prerendered_texture.cpp | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/src/mbgl/renderer/prerendered_texture.cpp b/src/mbgl/renderer/prerendered_texture.cpp new file mode 100644 index 0000000000..dd35f11372 --- /dev/null +++ b/src/mbgl/renderer/prerendered_texture.cpp @@ -0,0 +1,154 @@ +#include <mbgl/renderer/prerendered_texture.hpp> + +#include <mbgl/renderer/painter.hpp> +#include <mbgl/style/style_bucket.hpp> + +using namespace mbgl; + +PrerenderedTexture::PrerenderedTexture(const StyleBucketRaster &properties_) + : properties(properties_) { +} + +PrerenderedTexture::~PrerenderedTexture() { + if (texture != 0) { + glDeleteTextures(1, &texture); + texture = 0; + } + + if (fbo != 0) { + glDeleteFramebuffers(1, &fbo); + fbo = 0; + } +} + + +void PrerenderedTexture::bindTexture() { + if (texture == 0) { + bindFramebuffer(); + unbindFramebuffer(); + } + + glBindTexture(GL_TEXTURE_2D, texture); +} + +void PrerenderedTexture::bindFramebuffer() { + glGetIntegerv(GL_FRAMEBUFFER_BINDING, &previous_fbo); + + if (texture == 0) { + glGenTextures(1, &texture); + glBindTexture(GL_TEXTURE_2D, texture); +#ifndef GL_ES_VERSION_2_0 + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0); +#endif + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, properties.size, properties.size, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0); + glBindTexture(GL_TEXTURE_2D, 0); + } + + if (fbo_depth_stencil == 0) { + // Create depth/stencil buffer + glGenRenderbuffers(1, &fbo_depth_stencil); + glBindRenderbuffer(GL_RENDERBUFFER, fbo_depth_stencil); +#ifdef GL_ES_VERSION_2_0 + glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8_OES, properties.size, properties.size); +#else + glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, properties.size, properties.size); +#endif + glBindRenderbuffer(GL_RENDERBUFFER, 0); + } + + if (fbo == 0) { + glGenFramebuffers(1, &fbo); + glBindFramebuffer(GL_FRAMEBUFFER, fbo); + glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0); +#ifdef GL_ES_VERSION_2_0 + glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fbo_depth_stencil); + glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, fbo_depth_stencil); +#else + glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, fbo_depth_stencil); +#endif + + GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER); + if (status != GL_FRAMEBUFFER_COMPLETE) { + fprintf(stderr, "Couldn't create framebuffer: "); + switch (status) { + case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT: fprintf(stderr, "incomplete attachment\n"); break; + case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: fprintf(stderr, "incomplete missing attachment\n"); break; +#ifdef GL_ES_VERSION_2_0 + case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS: fprintf(stderr, "incomplete dimensions\n"); break; +#else + case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER: fprintf(stderr, "incomplete draw buffer\n"); break; +#endif + case GL_FRAMEBUFFER_UNSUPPORTED: fprintf(stderr, "unsupported\n"); break; + default: fprintf(stderr, "other\n"); break; + } + return; + } + } else { + glBindFramebuffer(GL_FRAMEBUFFER, fbo); + } +} + +void PrerenderedTexture::unbindFramebuffer() { + glBindFramebuffer(GL_FRAMEBUFFER, previous_fbo); + + if (fbo != 0) { + glDeleteFramebuffers(1, &fbo); + fbo = 0; + } +} + +void PrerenderedTexture::blur(Painter& painter, uint16_t passes) { + const GLuint original_texture = texture; + + // Create a secondary texture + GLuint secondary_texture; + glGenTextures(1, &secondary_texture); + glBindTexture(GL_TEXTURE_2D, secondary_texture); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, properties.size, properties.size, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0); + glBindTexture(GL_TEXTURE_2D, 0); + + + painter.useProgram(painter.gaussianShader->program); + painter.gaussianShader->u_matrix = painter.flipMatrix; + painter.gaussianShader->u_image = 0; + glActiveTexture(GL_TEXTURE0); + + for (int i = 0; i < passes; i++) { + // Render horizontal + glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, secondary_texture, 0); +#if GL_EXT_discard_framebuffer + const GLenum discards[] = { GL_COLOR_ATTACHMENT0 }; + glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, discards); +#endif + glClear(GL_COLOR_BUFFER_BIT); + + painter.gaussianShader->u_offset = {{ 1.0f / float(properties.size), 0 }}; + glBindTexture(GL_TEXTURE_2D, original_texture); + painter.coveringGaussianArray.bind(*painter.gaussianShader, painter.tileStencilBuffer, BUFFER_OFFSET(0)); + glDrawArrays(GL_TRIANGLES, 0, (GLsizei)painter.tileStencilBuffer.index()); + + + + // Render vertical + glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, original_texture, 0); +#if GL_EXT_discard_framebuffer + glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, discards); +#endif + glClear(GL_COLOR_BUFFER_BIT); + + painter.gaussianShader->u_offset = {{ 0, 1.0f / float(properties.size) }}; + glBindTexture(GL_TEXTURE_2D, secondary_texture); + painter.coveringGaussianArray.bind(*painter.gaussianShader, painter.tileStencilBuffer, BUFFER_OFFSET(0)); + glDrawArrays(GL_TRIANGLES, 0, (GLsizei)painter.tileStencilBuffer.index()); + } + + glDeleteTextures(1, &secondary_texture); +} |