Dolphin shaders

src/duskdolphin/display/shader/shaderdolphin.c

@@ -5,7 +5,159 @@
  * https://opensource.org/licenses/MIT
  */
 
-#include "shadergl.h"
 #include "util/memory.h"
 #include "util/string.h"
 #include "display/shader/shaderunlit.h"
+#include "assert/assert.h"
+#include "log/log.h"
+
+shaderdolphin_t *SHADER_BOUND;
+
+errorret_t shaderInitDolphin(
+  shaderdolphin_t *shader,
+  const shaderdefinitiondolphin_t *def
+) {
+  assertNotNull(shader, "Shader must not be null");
+  assertNotNull(def, "Shader definition must not be null");
+
+  memoryZero(shader, sizeof(shaderdolphin_t));
+
+  glm_mat4_identity(shader->view);
+  glm_mat4_identity(shader->proj);
+  glm_mat4_identity(shader->model);
+  shader->dirtyMatrix = (
+    SHADER_DOLPHIN_DIRTY_MODEL |
+    SHADER_DOLPHIN_DIRTY_PROJ |
+    SHADER_DOLPHIN_DIRTY_VIEW
+  );
+
+  errorOk();
+}
+
+errorret_t shaderBindDolphin(shaderdolphin_t *shader) {
+  assertNotNull(shader, "Shader must not be null");
+
+  SHADER_BOUND = shader;
+
+  
+  GX_LoadProjectionMtx(
+    shader->matrixProjection,
+    shader->isProjectionPerspective ? GX_PERSPECTIVE : GX_ORTHOGRAPHIC
+  );
+  GX_LoadPosMtxImm(shader->matrixModelView, GX_PNMTX0);
+
+  errorOk();
+}
+
+errorret_t shaderSetMatrixDolphin(
+  shaderdolphin_t *shader,
+  const char_t *name,
+  mat4 mat
+) {
+  assertNotNull(shader, "Shader must not be null");
+  assertNotNull(name, "Uniform name must not be null");
+  assertStrLenMin(name, 1, "Uniform name cannot be empty");
+  
+  if(stringCompare(name, SHADER_UNLIT_PROJECTION) == 0) {
+    shader->dirtyMatrix |= SHADER_DOLPHIN_DIRTY_PROJ;
+    glm_mat4_copy(mat, shader->proj);
+
+  } else if(stringCompare(name, SHADER_UNLIT_VIEW) == 0) {
+    shader->dirtyMatrix |= SHADER_DOLPHIN_DIRTY_VIEW;
+    glm_mat4_copy(mat, shader->view);
+
+  } else if(stringCompare(name, SHADER_UNLIT_MODEL) == 0) {
+    shader->dirtyMatrix |= SHADER_DOLPHIN_DIRTY_MODEL;
+    glm_mat4_copy(mat, shader->model);
+    
+  } else {
+    assertUnreachable("Cannot use a custom matrix on dolphin.");
+  }
+
+  errorOk();
+}
+
+errorret_t shaderDisposeDolphin(shaderdolphin_t *shader) {
+  assertNotNull(shader, "Shader must not be null");
+
+  SHADER_BOUND = NULL;
+
+  errorOk();
+}
+
+errorret_t shaderUpdateMVPDolphin() { 
+  assertNotNull(SHADER_BOUND, "Shader must not be null");
+
+  // Any changes?
+  if(SHADER_BOUND->dirtyMatrix == 0) errorOk();
+
+  // Need to update projection?
+  if((SHADER_BOUND->dirtyMatrix & SHADER_DOLPHIN_DIRTY_PROJ) != 0) {
+    shaderMat4ToMtx44(SHADER_BOUND->proj, SHADER_BOUND->matrixProjection);
+
+    // Fix projection Z mapping between GLM and GX.
+    float A = SHADER_BOUND->matrixProjection[2][2];
+    float B = SHADER_BOUND->matrixProjection[2][3];
+    SHADER_BOUND->matrixProjection[2][2] = 0.5f * (A + 1.0f);
+    SHADER_BOUND->matrixProjection[2][3] = 0.5f * B;
+
+    // Is this perspective or ortho originally? Dolphin cares for some reason.
+    const float_t epsilon = 0.0001f;
+    SHADER_BOUND->isProjectionPerspective = (
+      fabsf(SHADER_BOUND->proj[3][2]) > epsilon &&
+      fabsf(SHADER_BOUND->proj[3][3]) < epsilon
+    );
+
+    GX_LoadProjectionMtx(
+      SHADER_BOUND->matrixProjection,
+      SHADER_BOUND->isProjectionPerspective ? GX_PERSPECTIVE : GX_ORTHOGRAPHIC
+    );
+  }
+
+  // Need to update view or model?
+  bool_t mvDirt = false;
+  if((SHADER_BOUND->dirtyMatrix & SHADER_DOLPHIN_DIRTY_VIEW) != 0) {
+    shaderMat4ToMtx(SHADER_BOUND->view, SHADER_BOUND->matrixView);
+    mvDirt = true;
+  }
+
+  if((SHADER_BOUND->dirtyMatrix & SHADER_DOLPHIN_DIRTY_MODEL) != 0) {
+    shaderMat4ToMtx(SHADER_BOUND->model, SHADER_BOUND->matrixModel);
+    mvDirt = true;
+  }
+
+  // Set Model/View Matrix
+  if(mvDirt) {
+    guMtxConcat(
+      SHADER_BOUND->matrixView,
+      SHADER_BOUND->matrixModel,
+      SHADER_BOUND->matrixModelView
+    );
+    GX_LoadPosMtxImm(SHADER_BOUND->matrixModelView, GX_PNMTX0);
+  }
+
+  SHADER_BOUND->dirtyMatrix = 0;
+  errorOk();
+}
+
+void shaderMat4ToMtx44(const mat4 inGlmMatrix, Mtx44 outGXMatrix) {
+  assertNotNull(inGlmMatrix, "Input matrix cannot be null");
+  assertNotNull(outGXMatrix, "Output matrix cannot be null");
+
+  for(int row = 0; row < 4; ++row) {
+    for(int col = 0; col < 4; ++col) {
+      outGXMatrix[row][col] = inGlmMatrix[col][row];
+    }
+  }
+}
+
+void shaderMat4ToMtx(const mat4 inGlmMatrix, Mtx outGXMatrix) {
+  assertNotNull(inGlmMatrix, "Input matrix cannot be null");
+  assertNotNull(outGXMatrix, "Output matrix cannot be null");
+
+  for(int row = 0; row < 3; ++row) {
+    for(int col = 0; col < 4; ++col) {
+      outGXMatrix[row][col] = inGlmMatrix[col][row];
+    }
+  }
+}