GPU: Convert gpu_shader_interface.c to C++

1 files changed, 0 insertions, 518 deletions

diff --git a/source/blender/gpu/intern/gpu_shader_interface.c b/source/blender/gpu/intern/gpu_shader_interface.c
deleted file mode 100644
index 9d9f98c6bb0..00000000000
--- a/source/blender/gpu/intern/gpu_shader_interface.c
+++ /dev/null
@@ -1,518 +0,0 @@
-/*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- *
- * The Original Code is Copyright (C) 2016 by Mike Erwin.
- * All rights reserved.
- */
-
-/** \file
- * \ingroup gpu
- *
- * GPU shader interface (C --> GLSL)
- */
-
-#include "BKE_global.h"
-
-#include "BLI_bitmap.h"
-#include "BLI_math_base.h"
-
-#include "MEM_guardedalloc.h"
-
-#include "GPU_shader_interface.h"
-
-#include "gpu_batch_private.h"
-#include "gpu_context_private.h"
-
-#include <stddef.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define DEBUG_SHADER_INTERFACE 0
-
-#if DEBUG_SHADER_INTERFACE
-#  include <stdio.h>
-#endif
-
-static const char *BuiltinUniform_name(GPUUniformBuiltin u)
-{
-  static const char *names[] = {
-      [GPU_UNIFORM_MODEL] = "ModelMatrix",
-      [GPU_UNIFORM_VIEW] = "ViewMatrix",
-      [GPU_UNIFORM_MODELVIEW] = "ModelViewMatrix",
-      [GPU_UNIFORM_PROJECTION] = "ProjectionMatrix",
-      [GPU_UNIFORM_VIEWPROJECTION] = "ViewProjectionMatrix",
-      [GPU_UNIFORM_MVP] = "ModelViewProjectionMatrix",
-
-      [GPU_UNIFORM_MODEL_INV] = "ModelMatrixInverse",
-      [GPU_UNIFORM_VIEW_INV] = "ViewMatrixInverse",
-      [GPU_UNIFORM_MODELVIEW_INV] = "ModelViewMatrixInverse",
-      [GPU_UNIFORM_PROJECTION_INV] = "ProjectionMatrixInverse",
-      [GPU_UNIFORM_VIEWPROJECTION_INV] = "ViewProjectionMatrixInverse",
-
-      [GPU_UNIFORM_NORMAL] = "NormalMatrix",
-      [GPU_UNIFORM_ORCO] = "OrcoTexCoFactors",
-      [GPU_UNIFORM_CLIPPLANES] = "WorldClipPlanes",
-
-      [GPU_UNIFORM_COLOR] = "color",
-      [GPU_UNIFORM_BASE_INSTANCE] = "baseInstance",
-      [GPU_UNIFORM_RESOURCE_CHUNK] = "resourceChunk",
-      [GPU_UNIFORM_RESOURCE_ID] = "resourceId",
-      [GPU_UNIFORM_SRGB_TRANSFORM] = "srgbTarget",
-
-      [GPU_NUM_UNIFORMS] = NULL,
-  };
-
-  return names[u];
-}
-
-static const char *BuiltinUniformBlock_name(GPUUniformBlockBuiltin u)
-{
-  static const char *names[] = {
-      [GPU_UNIFORM_BLOCK_VIEW] = "viewBlock",
-      [GPU_UNIFORM_BLOCK_MODEL] = "modelBlock",
-      [GPU_UNIFORM_BLOCK_INFO] = "infoBlock",
-
-      [GPU_NUM_UNIFORM_BLOCKS] = NULL,
-  };
-
-  return names[u];
-}
-
-GPU_INLINE bool match(const char *a, const char *b)
-{
-  return strcmp(a, b) == 0;
-}
-
-GPU_INLINE uint hash_string(const char *str)
-{
-  uint i = 0, c;
-  while ((c = *str++)) {
-    i = i * 37 + c;
-  }
-  return i;
-}
-
-GPU_INLINE uint32_t set_input_name(GPUShaderInterface *shaderface,
-                                   GPUShaderInput *input,
-                                   char *name,
-                                   uint32_t name_len)
-{
-  /* remove "[0]" from array name */
-  if (name[name_len - 1] == ']') {
-    name[name_len - 3] = '\0';
-    name_len -= 3;
-  }
-
-  input->name_offset = (uint32_t)(name - shaderface->name_buffer);
-  input->name_hash = hash_string(name);
-  return name_len + 1; /* include NULL terminator */
-}
-
-GPU_INLINE const GPUShaderInput *input_lookup(const GPUShaderInterface *shaderface,
-                                              const GPUShaderInput *const inputs,
-                                              const uint inputs_len,
-                                              const char *name)
-{
-  const uint name_hash = hash_string(name);
-  /* Simple linear search for now. */
-  for (int i = inputs_len - 1; i >= 0; i--) {
-    if (inputs[i].name_hash == name_hash) {
-      if ((i > 0) && UNLIKELY(inputs[i - 1].name_hash == name_hash)) {
-        /* Hash colision resolve. */
-        for (; i >= 0 && inputs[i].name_hash == name_hash; i--) {
-          if (match(name, shaderface->name_buffer + inputs[i].name_offset)) {
-            return inputs + i; /* not found */
-          }
-        }
-        return NULL; /* not found */
-      }
-      else {
-        /* This is a bit dangerous since we could have a hash collision.
-         * where the asked uniform that does not exist has the same hash
-         * as a real uniform. */
-        BLI_assert(match(name, shaderface->name_buffer + inputs[i].name_offset));
-        return inputs + i;
-      }
-    }
-  }
-  return NULL; /* not found */
-}
-
-/* Note that this modify the src array. */
-GPU_INLINE void sort_input_list(GPUShaderInput *dst, GPUShaderInput *src, const uint input_len)
-{
-  for (uint i = 0; i < input_len; i++) {
-    GPUShaderInput *input_src = &src[0];
-    for (uint j = 1; j < input_len; j++) {
-      if (src[j].name_hash > input_src->name_hash) {
-        input_src = &src[j];
-      }
-    }
-    dst[i] = *input_src;
-    input_src->name_hash = 0;
-  }
-}
-
-static int block_binding(int32_t program, uint32_t block_index)
-{
-  /* For now just assign a consecutive index. In the future, we should set it in
-   * the shader using layout(binding = i) and query its value. */
-  glUniformBlockBinding(program, block_index, block_index);
-  return block_index;
-}
-
-static int sampler_binding(int32_t program,
-                           uint32_t uniform_index,
-                           int32_t uniform_location,
-                           int *sampler_len)
-{
-  /* Identify sampler uniforms and asign sampler units to them. */
-  GLint type;
-  glGetActiveUniformsiv(program, 1, &uniform_index, GL_UNIFORM_TYPE, &type);
-
-  switch (type) {
-    case GL_SAMPLER_1D:
-    case GL_SAMPLER_2D:
-    case GL_SAMPLER_3D:
-    case GL_SAMPLER_CUBE:
-    case GL_SAMPLER_CUBE_MAP_ARRAY_ARB: /* OpenGL 4.0 */
-    case GL_SAMPLER_1D_SHADOW:
-    case GL_SAMPLER_2D_SHADOW:
-    case GL_SAMPLER_1D_ARRAY:
-    case GL_SAMPLER_2D_ARRAY:
-    case GL_SAMPLER_1D_ARRAY_SHADOW:
-    case GL_SAMPLER_2D_ARRAY_SHADOW:
-    case GL_SAMPLER_2D_MULTISAMPLE:
-    case GL_SAMPLER_2D_MULTISAMPLE_ARRAY:
-    case GL_SAMPLER_CUBE_SHADOW:
-    case GL_SAMPLER_BUFFER:
-    case GL_INT_SAMPLER_1D:
-    case GL_INT_SAMPLER_2D:
-    case GL_INT_SAMPLER_3D:
-    case GL_INT_SAMPLER_CUBE:
-    case GL_INT_SAMPLER_1D_ARRAY:
-    case GL_INT_SAMPLER_2D_ARRAY:
-    case GL_INT_SAMPLER_2D_MULTISAMPLE:
-    case GL_INT_SAMPLER_2D_MULTISAMPLE_ARRAY:
-    case GL_INT_SAMPLER_BUFFER:
-    case GL_UNSIGNED_INT_SAMPLER_1D:
-    case GL_UNSIGNED_INT_SAMPLER_2D:
-    case GL_UNSIGNED_INT_SAMPLER_3D:
-    case GL_UNSIGNED_INT_SAMPLER_CUBE:
-    case GL_UNSIGNED_INT_SAMPLER_1D_ARRAY:
-    case GL_UNSIGNED_INT_SAMPLER_2D_ARRAY:
-    case GL_UNSIGNED_INT_SAMPLER_2D_MULTISAMPLE:
-    case GL_UNSIGNED_INT_SAMPLER_2D_MULTISAMPLE_ARRAY:
-    case GL_UNSIGNED_INT_SAMPLER_BUFFER: {
-      /* For now just assign a consecutive index. In the future, we should set it in
-       * the shader using layout(binding = i) and query its value. */
-      int binding = *sampler_len;
-      glUniform1i(uniform_location, binding);
-      (*sampler_len)++;
-      return binding;
-    }
-    default:
-      return -1;
-  }
-}
-
-GPUShaderInterface *GPU_shaderinterface_create(int32_t program)
-{
-#ifndef NDEBUG
-  GLint curr_program;
-  glGetIntegerv(GL_CURRENT_PROGRAM, &curr_program);
-  BLI_assert(curr_program == program);
-#endif
-
-  GLint max_attr_name_len = 0, attr_len = 0;
-  glGetProgramiv(program, GL_ACTIVE_ATTRIBUTE_MAX_LENGTH, &max_attr_name_len);
-  glGetProgramiv(program, GL_ACTIVE_ATTRIBUTES, &attr_len);
-
-  GLint max_ubo_name_len = 0, ubo_len = 0;
-  glGetProgramiv(program, GL_ACTIVE_UNIFORM_BLOCK_MAX_NAME_LENGTH, &max_ubo_name_len);
-  glGetProgramiv(program, GL_ACTIVE_UNIFORM_BLOCKS, &ubo_len);
-
-  GLint max_uniform_name_len = 0, active_uniform_len = 0, uniform_len = 0;
-  glGetProgramiv(program, GL_ACTIVE_UNIFORM_MAX_LENGTH, &max_uniform_name_len);
-  glGetProgramiv(program, GL_ACTIVE_UNIFORMS, &active_uniform_len);
-  uniform_len = active_uniform_len;
-
-  /* Work around driver bug with Intel HD 4600 on Windows 7/8, where
-   * GL_ACTIVE_UNIFORM_BLOCK_MAX_NAME_LENGTH does not work. */
-  if (attr_len > 0 && max_attr_name_len == 0) {
-    max_attr_name_len = 256;
-  }
-  if (ubo_len > 0 && max_ubo_name_len == 0) {
-    max_ubo_name_len = 256;
-  }
-  if (uniform_len > 0 && max_uniform_name_len == 0) {
-    max_uniform_name_len = 256;
-  }
-
-  /* GL_ACTIVE_UNIFORMS lied to us! Remove the UBO uniforms from the total before
-   * allocating the uniform array. */
-  GLint max_ubo_uni_len = 0;
-  for (int i = 0; i < ubo_len; i++) {
-    GLint ubo_uni_len;
-    glGetActiveUniformBlockiv(program, i, GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS, &ubo_uni_len);
-    max_ubo_uni_len = max_ii(max_ubo_uni_len, ubo_uni_len);
-    uniform_len -= ubo_uni_len;
-  }
-  /* Bit set to true if uniform comes from a uniform block. */
-  BLI_bitmap *uniforms_from_blocks = BLI_BITMAP_NEW(active_uniform_len, __func__);
-  /* Set uniforms from block for exclusion. */
-  GLint *ubo_uni_ids = MEM_mallocN(sizeof(GLint) * max_ubo_uni_len, __func__);
-  for (int i = 0; i < ubo_len; i++) {
-    GLint ubo_uni_len;
-    glGetActiveUniformBlockiv(program, i, GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS, &ubo_uni_len);
-    glGetActiveUniformBlockiv(program, i, GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES, ubo_uni_ids);
-    for (int u = 0; u < ubo_uni_len; u++) {
-      BLI_BITMAP_ENABLE(uniforms_from_blocks, ubo_uni_ids[u]);
-    }
-  }
-  MEM_freeN(ubo_uni_ids);
-
-  uint32_t name_buffer_offset = 0;
-  const uint32_t name_buffer_len = attr_len * max_attr_name_len + ubo_len * max_ubo_name_len +
-                                   uniform_len * max_uniform_name_len;
-
-  int input_tot_len = attr_len + ubo_len + uniform_len;
-  size_t interface_size = sizeof(GPUShaderInterface) + sizeof(GPUShaderInput) * input_tot_len;
-
-  GPUShaderInterface *shaderface = MEM_callocN(interface_size, "GPUShaderInterface");
-  shaderface->attribute_len = attr_len;
-  shaderface->ubo_len = ubo_len;
-  shaderface->uniform_len = uniform_len;
-  shaderface->name_buffer = MEM_mallocN(name_buffer_len, "name_buffer");
-  GPUShaderInput *inputs = shaderface->inputs;
-
-  /* Temp buffer. */
-  int input_tmp_len = max_iii(attr_len, ubo_len, uniform_len);
-  GPUShaderInput *inputs_tmp = MEM_mallocN(sizeof(GPUShaderInput) * input_tmp_len, "name_buffer");
-
-  /* Attributes */
-  shaderface->enabled_attr_mask = 0;
-  for (int i = 0, idx = 0; i < attr_len; i++) {
-    char *name = shaderface->name_buffer + name_buffer_offset;
-    GLsizei remaining_buffer = name_buffer_len - name_buffer_offset;
-    GLsizei name_len = 0;
-    GLenum type;
-    GLint size;
-
-    glGetActiveAttrib(program, i, remaining_buffer, &name_len, &size, &type, name);
-    GLint location = glGetAttribLocation(program, name);
-    /* Ignore OpenGL names like `gl_BaseInstanceARB`, `gl_InstanceID` and `gl_VertexID`. */
-    if (location == -1) {
-      shaderface->attribute_len--;
-      continue;
-    }
-
-    GPUShaderInput *input = &inputs_tmp[idx++];
-    input->location = input->binding = location;
-
-    name_buffer_offset += set_input_name(shaderface, input, name, name_len);
-    shaderface->enabled_attr_mask |= (1 << input->location);
-  }
-  sort_input_list(inputs, inputs_tmp, shaderface->attribute_len);
-  inputs += shaderface->attribute_len;
-
-  /* Uniform Blocks */
-  for (int i = 0, idx = 0; i < ubo_len; i++) {
-    char *name = shaderface->name_buffer + name_buffer_offset;
-    GLsizei remaining_buffer = name_buffer_len - name_buffer_offset;
-    GLsizei name_len = 0;
-
-    glGetActiveUniformBlockName(program, i, remaining_buffer, &name_len, name);
-
-    GPUShaderInput *input = &inputs_tmp[idx++];
-    input->binding = input->location = block_binding(program, i);
-
-    name_buffer_offset += set_input_name(shaderface, input, name, name_len);
-    shaderface->enabled_ubo_mask |= (1 << input->binding);
-  }
-  sort_input_list(inputs, inputs_tmp, shaderface->ubo_len);
-  inputs += shaderface->ubo_len;
-
-  /* Uniforms */
-  for (int i = 0, idx = 0, sampler = 0; i < active_uniform_len; i++) {
-    if (BLI_BITMAP_TEST(uniforms_from_blocks, i)) {
-      continue;
-    }
-    char *name = shaderface->name_buffer + name_buffer_offset;
-    GLsizei remaining_buffer = name_buffer_len - name_buffer_offset;
-    GLsizei name_len = 0;
-
-    glGetActiveUniformName(program, i, remaining_buffer, &name_len, name);
-
-    GPUShaderInput *input = &inputs_tmp[idx++];
-    input->location = glGetUniformLocation(program, name);
-    input->binding = sampler_binding(program, i, input->location, &sampler);
-
-    name_buffer_offset += set_input_name(shaderface, input, name, name_len);
-    shaderface->enabled_tex_mask |= (input->binding != -1) ? (1lu << input->binding) : 0lu;
-  }
-  sort_input_list(inputs, inputs_tmp, shaderface->uniform_len);
-
-  /* Builtin Uniforms */
-  for (GPUUniformBuiltin u = 0; u < GPU_NUM_UNIFORMS; u++) {
-    shaderface->builtins[u] = glGetUniformLocation(program, BuiltinUniform_name(u));
-  }
-
-  /* Builtin Uniforms Blocks */
-  for (GPUUniformBlockBuiltin u = 0; u < GPU_NUM_UNIFORM_BLOCKS; u++) {
-    const GPUShaderInput *block = GPU_shaderinterface_ubo(shaderface, BuiltinUniformBlock_name(u));
-    shaderface->builtin_blocks[u] = (block != NULL) ? block->binding : -1;
-  }
-
-  /* Batches ref buffer */
-  shaderface->batches_len = GPU_SHADERINTERFACE_REF_ALLOC_COUNT;
-  shaderface->batches = MEM_callocN(shaderface->batches_len * sizeof(GPUBatch *),
-                                    "GPUShaderInterface batches");
-
-  MEM_freeN(uniforms_from_blocks);
-  MEM_freeN(inputs_tmp);
-
-  /* Resize name buffer to save some memory. */
-  if (name_buffer_offset < name_buffer_len) {
-    shaderface->name_buffer = MEM_reallocN(shaderface->name_buffer, name_buffer_offset);
-  }
-
-#if DEBUG_SHADER_INTERFACE
-  char *name_buf = shaderface->name_buffer;
-  printf("--- GPUShaderInterface %p, program %d ---\n", shaderface, program);
-  if (shaderface->attribute_len > 0) {
-    printf("Attributes {\n");
-    for (int i = 0; i < shaderface->attribute_len; i++) {
-      GPUShaderInput *input = shaderface->inputs + i;
-      printf("\t(location = %d) %s;\n", input->location, name_buf + input->name_offset);
-    }
-    printf("};\n");
-  }
-  if (shaderface->ubo_len > 0) {
-    printf("Uniform Buffer Objects {\n");
-    for (int i = 0; i < shaderface->ubo_len; i++) {
-      GPUShaderInput *input = shaderface->inputs + shaderface->attribute_len + i;
-      printf("\t(binding = %d) %s;\n", input->binding, name_buf + input->name_offset);
-    }
-    printf("};\n");
-  }
-  if (shaderface->enabled_tex_mask > 0) {
-    printf("Samplers {\n");
-    for (int i = 0; i < shaderface->uniform_len; i++) {
-      GPUShaderInput *input = shaderface->inputs + shaderface->attribute_len +
-                              shaderface->ubo_len + i;
-      if (input->binding != -1) {
-        printf("\t(location = %d, binding = %d) %s;\n",
-               input->location,
-               input->binding,
-               name_buf + input->name_offset);
-      }
-    }
-    printf("};\n");
-  }
-  if (shaderface->uniform_len > 0) {
-    printf("Uniforms {\n");
-    for (int i = 0; i < shaderface->uniform_len; i++) {
-      GPUShaderInput *input = shaderface->inputs + shaderface->attribute_len +
-                              shaderface->ubo_len + i;
-      if (input->binding == -1) {
-        printf("\t(location = %d) %s;\n", input->location, name_buf + input->name_offset);
-      }
-    }
-    printf("};\n");
-  }
-  printf("--- GPUShaderInterface end ---\n\n");
-#endif
-
-  return shaderface;
-}
-
-void GPU_shaderinterface_discard(GPUShaderInterface *shaderface)
-{
-  /* Free memory used by name_buffer. */
-  MEM_freeN(shaderface->name_buffer);
-  /* Remove this interface from all linked Batches vao cache. */
-  for (int i = 0; i < shaderface->batches_len; i++) {
-    if (shaderface->batches[i] != NULL) {
-      gpu_batch_remove_interface_ref(shaderface->batches[i], shaderface);
-    }
-  }
-  MEM_freeN(shaderface->batches);
-  /* Free memory used by shader interface by its self. */
-  MEM_freeN(shaderface);
-}
-
-const GPUShaderInput *GPU_shaderinterface_attr(const GPUShaderInterface *shaderface,
-                                               const char *name)
-{
-  uint ofs = 0;
-  return input_lookup(shaderface, shaderface->inputs + ofs, shaderface->attribute_len, name);
-}
-
-const GPUShaderInput *GPU_shaderinterface_ubo(const GPUShaderInterface *shaderface,
-                                              const char *name)
-{
-  uint ofs = shaderface->attribute_len;
-  return input_lookup(shaderface, shaderface->inputs + ofs, shaderface->ubo_len, name);
-}
-
-const GPUShaderInput *GPU_shaderinterface_uniform(const GPUShaderInterface *shaderface,
-                                                  const char *name)
-{
-  uint ofs = shaderface->attribute_len + shaderface->ubo_len;
-  return input_lookup(shaderface, shaderface->inputs + ofs, shaderface->uniform_len, name);
-}
-
-int32_t GPU_shaderinterface_uniform_builtin(const GPUShaderInterface *shaderface,
-                                            GPUUniformBuiltin builtin)
-{
-  BLI_assert(builtin >= 0 && builtin < GPU_NUM_UNIFORMS);
-  return shaderface->builtins[builtin];
-}
-
-int32_t GPU_shaderinterface_block_builtin(const GPUShaderInterface *shaderface,
-                                          GPUUniformBlockBuiltin builtin)
-{
-  BLI_assert(builtin >= 0 && builtin < GPU_NUM_UNIFORM_BLOCKS);
-  return shaderface->builtin_blocks[builtin];
-}
-
-void GPU_shaderinterface_add_batch_ref(GPUShaderInterface *shaderface, GPUBatch *batch)
-{
-  int i; /* find first unused slot */
-  for (i = 0; i < shaderface->batches_len; i++) {
-    if (shaderface->batches[i] == NULL) {
-      break;
-    }
-  }
-  if (i == shaderface->batches_len) {
-    /* Not enough place, realloc the array. */
-    i = shaderface->batches_len;
-    shaderface->batches_len += GPU_SHADERINTERFACE_REF_ALLOC_COUNT;
-    shaderface->batches = MEM_recallocN(shaderface->batches,
-                                        sizeof(GPUBatch *) * shaderface->batches_len);
-  }
-  shaderface->batches[i] = batch;
-}
-
-void GPU_shaderinterface_remove_batch_ref(GPUShaderInterface *shaderface, GPUBatch *batch)
-{
-  for (int i = 0; i < shaderface->batches_len; i++) {
-    if (shaderface->batches[i] == batch) {
-      shaderface->batches[i] = NULL;
-      break; /* cannot have duplicates */
-    }
-  }
-}